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Seeking advice: New lens: Nikon 105 f2 DC or Fuji 90 f2

Started Feb 22, 2018 | Questions thread
SpacemanUA
SpacemanUA Senior Member • Posts: 1,773
Re: Seeking advice: New lens: Nikon 105 f2 DC or Fuji 90 f2

MisterHairy wrote:

What bad math, pray tell? My comments about aperture size are correct and if you read what I have written, I have said that a lens' "speed" is a characteristic of the lens and is not dependent upon the camera, sensor or film. An f/2 lens is even an f/2 lens if it not connected to a camera.

And what's the point of your speech then? Just to get us know that 135/2 has bigger entrance pupil diameter? Breaking news!

A 135/2 lens does have a larger maximum aperture than a 90/2 lens; it is more than twice as large in terms of area.

Who cares? A lens is supposed to cover APS-C sensor in our case, so even if it would've been 500m in diameter, in won't change anything. It will transmit same 1/2 portion of light through it and will have same "speed" as 90/2, cause 90/2 is just big enough for APS-C sensor. Who the hell measure this "aperture area" if aperture is a relative value in camera lenses.

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